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Old 08-02-2021, 05:50 PM   #1
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Surge Protector Advice.

I think I've narrowed it down. Hughes Autoformers PWD50-EPO vs PROGRESSIVE INDUSTRIES EMS-PT50X Portable RV Surge Protector.

Pros and cons? Other than the $100 difference in price.
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Old 08-02-2021, 06:05 PM   #2
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Quote:
Originally Posted by amosnandy View Post
I think I've narrowed it down. Hughes Autoformers PWD50-EPO vs PROGRESSIVE INDUSTRIES EMS-PT50X Portable RV Surge Protector.

Pros and cons? Other than the $100 difference in price.
An autoformer will boost the in coming AC voltage to make sure you will not have low voltage. It does this by sacrificing current. It will draw more current to keep you voltage within spec. You will not be able to draw as much overall power, but your voltage will be high enough to protect you. That being said, it will lower the line voltage to all other rigs in series with yours, because the higher the current over the line means more voltage dropped across that line. I was held just above the tripping point at one RV park by someone at the end of the circuit using an autoformer. My surge protector would trip on an off over the heat of the day. Latent failures - living room TV, converter, microwave oven, one AC unit in the bedroom, refrigerator, etc.. Each failed within six months of this happening at different times. So as some people express in Forums, too bad, so be a crappy, unethical neighbor and not care what you do to other people. Some parks have outlawed autoformers for this exact reason.
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Old 08-02-2021, 06:55 PM   #3
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Originally Posted by mlpeloquin View Post
An autoformer will boost the in coming AC voltage to make sure you will not have low voltage.
The Hughes Autoformers company that started out by making only their Autoformer product now also makes surge protectors and EMS systems. They may be wishing their corporate name no longer had "Autoformers" as part of it.

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Old 08-02-2021, 06:57 PM   #4
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I have had the Progressive Industries portable 30A unit for my last coach and I installed the hardwired 50A version in my current coach. I have been very pleased with both and they offer a lifetime warranty.

I prefer hardwired over portable for two reasons:

- You can install it so that it protects against both shore power issues and generator power issues.

- You don't have to worry about locking the portable one to the pedestal.
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Old 08-03-2021, 02:12 PM   #5
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Originally Posted by mlpeloquin View Post
An autoformer will boost the in coming AC voltage to make sure you will not have low voltage. It does this by sacrificing current. It will draw more current to keep you voltage within spec. You will not be able to draw as much overall power, but your voltage will be high enough to protect you. That being said, it will lower the line voltage to all other rigs in series with yours, because the higher the current over the line means more voltage dropped across that line. I was held just above the tripping point at one RV park by someone at the end of the circuit using an autoformer. My surge protector would trip on an off over the heat of the day. Latent failures - living room TV, converter, microwave oven, one AC unit in the bedroom, refrigerator, etc.. Each failed within six months of this happening at different times. So as some people express in Forums, too bad, so be a crappy, unethical neighbor and not care what you do to other people. Some parks have outlawed autoformers for this exact reason.
I do not believe this is the unit that boosts voltage. I think this is just a surge protector.

I do have a SOLA ISB 4000 that we use in Mexico because the power swings so widely. It will handle 104 volts to 139 volts and change the output to 117-121. You will never find these in the US.
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Old 08-03-2021, 02:29 PM   #6
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Originally Posted by amosnandy View Post
I think I've narrowed it down. Hughes Autoformers PWD50-EPO vs PROGRESSIVE INDUSTRIES EMS-PT50X Portable RV Surge Protector.

Pros and cons? Other than the $100 difference in price.
It appears the $100 difference is the fact that the Huges you can replace the surge module, where the progressive, if you get a surge, you replace the whole thing.

Other than that they seem to do the same thing. Check for correctly wired power, shut down if voltage drops to low or you reach an overload.

Since something like a lightning strike, or possibly a shorted high voltage transformer on the grid, replacing is probably not a big deal.
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Old 08-03-2021, 03:10 PM   #7
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I chose the Hughes for my surge EMS and have been very happy with it. The Hughes has a BluTooth app that allows you to monitor each leg for voltage, current, KW, and total power usage. This is excellent for longer term camping. However, the BluTooth signal isn't all that strong -- it will lose connection if I leave my phone in the front of the coach. The Hughes was $100 cheaper than the Progressive.
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